Bulova factory Buloloy Insertopak mainspring for caliber 10CSC - Alloy

Bulova factory Buloloy Insertopak mainspring for caliber 10CSC, alloy, new in package. See images for specifications and interchangeability. I likely have several of these so the one you get may differ slightly from the images. The wonderful thing about factory mainsprings is they always fit. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.